PURPOSE: To provide a floor structure for a greenhouse, etc., capable of remov ing a pool due to water sprinkling and moderately humidifying the interior of a room therein.

CONSTITUTION: This floor structure for a greenhouse, etc., is obtained by laying crushed stones 4, etc., on the ground surface 3, forming a hydrous layer 5 having a prescribed thickness, forming a water-impermeable paving layer 6 having a prescribed thickness by asphalt, etc., on the hydrous layer 5, forming holes 8 passing to the hydrous layer 5 in the water-impermeable paving layer 6 and filling a water-permeable paving material 9 in the holes 8.